Typewriting machine



A. G. F. KUROWSKL TYPEWRITING MACHINE.

APPLICATION r|| :0 JULY 15. 1919.

1,408,009. Patented Feb. 28, 1922.

by Af/Orne Unitas STAEES PATENT QFEKIE.

ALFRED G. F. KUROWSKI, OF BROOKLYN, NEW YORK, ASSIGNOR TO UNDERWOOD TYPEWRITER GO1\'I1?ANY, -OF NEW YORK, N. Y., A (l0RI(HMX'JTION OF DELAWARE.

TYPEWRITING MACHINE;

Application filed July 15,

To all whom it may concern:

Be it known that I, ALFRED G. F, KU- nowsnr, a citizen of the United States, formerly a citizen of Germany, residing in Brooklyn Borough, in the county of Kings, city and State'of New York, have invented certain new and useful Improvements in Typeu "riting Machines, of which the following is a specification. p

This invention relates to typewriting machines, and is herein disclosed as modifying the line-spacing mechanism of an Underwood standard typewriting machine In rapid line-spacing of the revoluble platen, there is sometimes such sudden starting and stopping of the platen that the paper held against the platen by the feed-rolls may slip, resulting in faulty line-spacing.

According to the present invention, unexcessively rapid operation of the usual linespace lever need not start the platen at the same speed as the line-space wheel, thereby minimizing or avoiding the liability of the work-sheet to feed irregularly, and when the line-spacing operation is finished the platen may come to rest more slowly. The linespace wheel may be for this purposeadapted to start ahead of the platen, or to revolve to a small extent independently of the platen, but nevertheless it tends to turn the platen with'it. Hence, the rapid starting of the line-space wheel may start the platen slowly, and the sudden arresting of the line space wheel will not simultaneously arrest the platen but will allow it to continue to turn more slowly until. the two resume their normal relation. H

. To effect this result, the line-space wheel maybe journaled loosely, upon the platen axle, and maybe connected to said axle by. a cam and a spring-pressed dog or follower, the spring and dog tending to make the line space wheel and the platen turn together, but the dog slipping upon the cam if the line-space wheel is started too rapidly. The spring therefore gages or determines the speed at which. the platen may be started to rotate, andalso is effective to restore the normal position of both the slipping dog and the platen relatively to the line-space wheel.

Other features and advantages will here inafter appear.

i In the accompanying drawings,

Figure 1 is a perspective view of one end of an Underwood platen shift frame with Specification of Letters Patent. Patented Feb. 28, 1922.

1919. Serial No. 310,911.

parts largely broken away, and showing the present invention as applied thereto.

Figure 2 is an end sectional view of the parts shown in Figure 1, with the parts positioned as occurs in an extremely rapid operation of line-spacing.

Figure 3 is a view similar to Figure 2, but showing the parts at rest at the close of a line-spacing operation.

Figure 4 is a side view, partly in section, of the line-space wheel and its connections to the platen axle.

Figure 5 is a perspective view of the linespace wheel, the pawl and spring, the parts being spaced apart to show' their details clearly. i I

Figure 6 is a similar perspective view of the hub on the platen axle on which the linespace wheel may be journaled.

In the ordinary operation of typewriting,

a work-sheet, not shown,-is held against the platen 10 by means of feed-rolls 11 and 12,

and is adapted to be line-spaced by actuation of the line-space handle 13, which is pivoted upon the carriage at 14,and is adapted to actuate a slide 15 mounted upon the shift frame 16. Upon the actuation of the handle 18, the slide 15 moves rearwardly from the Figure 1 position against the tension of its spring 17 through the Figure 2 position to the Figure 3 position, in which the pawl 18, pivoted at 19 upon the slide 15, is arrested, by an overthrow stop 20, which is adapted to be struck by an extension 21 of the pawlhaving a cam surface which in arresting it forces the pawl downwardly into the teeth ofthe line-space wheel 22. The line-space wheel normally tends to turn with:

a hub 23, which is normally fast tothe platen axle '24, being held thereto by the usual Underwood platen release clutch 25, one form of which is shown in the patent to lrhlelmond ld'o. 1,225,331, dated May 8, 191 r Y The line sp'ace'wheel 22 is journaled upon a peripheral surface 26, on the hub23, which is provided with a ledge or rabbet 27 to hold the linespace wheel against a ledge 28 formed by a plate or disk 29 also forming part of the hub and held to the main part 23 of the hub by screws 30, of which there may be three symmetrically disposed around the axle 24. The plate 29 is formed integral with the collar 31, whichcextends out from the clutch 25, and which, in. some forms of.

to fit the correspondingly faced end or nose 3% of a pawl 35, which is" pivoted upon the line-space wheel at 36, and which 18 held in the notch ordepression 33 by a rather strong spring In the form of the device herein illust-rated, the spring 37 is formed as a flat spring lying just outside the periphery of the plate 29, beingheld in place by a screw 38 and a pin 39, and being flat so that it underlies the tail 40 of the: pawl 35, and when lying fiat against the periphery of the plate 529vforrns .a stop forthe pawl 35 as its nose swings outward. If the line-space lever 13 is actuated violently, the pawl 35 is started so rapidly by the linespace wheel that its nose 8 lridesout of the .notch 38 upon a cam surface 41 forming an extension of the plate 29 until the tail 40 is arrested against the spring. After the tail &0 is thus arrested, the line-space wheel and the hub 23 turn together until the line-space wheel is arrested by the pawl 18 in striking the stop 20, and then the platen, continuingto turn by inertia aided by the spring 37, moves forward from the Figure 2 posit-ion to the Figure 3 position, and is arrested by the nose of the pawl which bears against a steep slope 42 of the notch 33. The platen comes to rest in its proper position because the spring 87 acting on the pawl centers it there, and the line-space wheel 22 is in the meantime'held at the proper position by the usual spring detent .43. Upon release of the line space handle, the spring 17 returns it and the slide and pawl 18 to their normal positions ready for the next line-spacing open ation, the detent 48 in the meantime holding the line-space wheel at its proper position.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

'1. In a typewriting machine, the combination with a revoluble plat-en and a line-spacev lever, of a line-space wheel, a pawl driven by said lever for driving said wheel, an axle fastto said plate'n,a disk fastto' said axle,

a second pawl pivoted to said wheel, a cam on said disk against which'said second pawl bears, a springtending to swingsaid second pawl against said cam'to advance the platen, and a device-to limit the travel of the second pawl on the canrto cause :the line-space wheel to positively drive the disk when the limit of travel of the second pawl is reached.

2. In a :typewriting machine, the "combination with a revoluble platen and a linespace lever, of a llIlBeSPflCB wheel, a pawl driven by said lever for driving said wheel,

an axle fast to said platen, a disk fast to said axle, a second pawl pivoted to said wheel, a cam on said disk against which said second pawl bears, a spring tending to swin said second pawl against said cam to ac vance the platen, and a tail upon said second pawl adapted to be positively arrested by-p'art of said disk'to cause the line-- space wheel to positively drive the disk af ter the pawl has tended to turn the disk.

8. In a typewriting machine, the combi-, nation with a revoluble platen and an axle'to which it is fast, of a hub 011 said axle, a line-space wheel journaled on said hub, a cam, a pawl 'havinga follower cam nose forming the connectionbetween'the wheel and the hub, a detent for said line-space wheel, a linespace pawl for driving said wheel, a spring effective on the first pawl tending to force the pawl to one end of the cam to'advance the platen, and means to limit the travel of the pawl onthe cam in each direction. 7

5. In a typewritingmachine, the combination with a revoluble platen and an axle to which it is fast, of a hub on said axle, a linespace wheel journaled on said hub, an extension of said hubforniing a cam, a fol lower upon said wheel to bear upon the cam, a spring pressing said follower'to advance the platen, and means limiting the travel of the followeruponthe cam."

6. In a typewriting machine, the comb'ina tion with a revolub'le platen and anaxle to which it is fast, of ahub onsaidaxle, a linespace wheel journaled on said hub, an extension of said huh forming a canna follower comprising a nose normally caught in a depression of said cam and'pivoted ,upon

the wheel to bear'uponthe cam, a spring normally holding thefollower inthe depression, and tending to return the] follower to the depression to advance the platen', and a stop for said follower to limitits'travelto cause the follower to positively move the platen.

7. In atypewritingmachine,the combination with a revoluble platen and an axle to which it is fast, of a hub on saidaxle, a linespace wheel revoluhle on said axle, a pawl pivoted on said wheel and normally resting said pawl against the cam to cam it into the depression, and a tail for said pawl adapted to strike said hub to limit the movement of the wheel relatively to the axle.

8. In a typewritingmachine,the combination with a revoluble platen and an axle to which it is fast, of a hub on said axle forming a journal, a line-space wheel adapted to turn on said journal, extensions of the hub -forming guides for the line-space wheel, a pawl pivoted on the wheel adapted to lie in a depression on one extension, a tail of said pawl normally standing clear of the extension, and a spring for holding the pawl in the depression.

9. In a typewriting machine, the combination with a revoluble platen and an axle to which it is fast, of a hub on said axle forming a journal, a line-space wheel adapted to turn on said journal, extensions of the hub forming guides for the line space wheel, a pawl pivoted on the wheel and having a double cam nose adapted to fit in a depression on one extension, a tail of said pawl normally standing clear of the extension and adapted to strike the extension after a limited throw, and a spring returning said nose to position the platen relatively to the line-space wheel.

10. In a typewriting machine, the combination with a revoluble platen and an axle to which it is fast, of a line-space wheel revoluble on said axle, a hub for said wheel forming a journal for it and comprising a rabbet to form a ledge to hold it in place and fast to the axle, a plate adapted to form another ledge to hold the wheel in place, a pawl pivoted upon the wheel comprising a nose adapted to rest in a cam depression in one of the ledges, a cam extension of that ledge to co-operate with the nose, a spring tending to hold the nose in the depression,

and a tail of thepawl adapted to limit the throw of the wheel in advance of the hub.

11. In a typewriting machine, the combination with a revoluble platen and an axle to which it is fast, of a line-space wheel revoluble on said axle, a hub for said wheel forming a journal for it and comprising a rabbet to form a ledge to hold it in place and fast to the axle, a plate adapted to form another ledge to hold the wheel in place, a pawl pivoted upon the wheel comprising a nose adapted to rest in a cam depression in one of the ledges, a cam extension of that ledge-to co-operate with the nose, a fiat spring lying upon the periphery of one of the ledges, and a tail of the pawl overlying the spring and the periphery and adapted to be arrested by the spring striking the ledge to limit the throw of the wheel in advance of the hub.

12. In a typewriting machine, the combination with a revoluble platen, of an axle therefor, a hub mounted upon said axle, a line-space wheel mounted for independent movement upon said hub, an extension of said hub comprising a plate having a camsurface, a pawl pivoted upon said line-space wheel having one end in contact with the cam-surface and the other end free, and a spring fixed to said line-space wheel and having its free end pressing against the free end of the pawl to force the opposite end of the pawl against the cam-surface, so that movement of said line-space wheel forces one end of the pawl upward on said camsurface, and forces the free end of the pawl downward against the tension of the spring until it contacts with the cam-surface plate to lock the line-space wheel to said plate.

13. In a typewriting machine, the combination with a revoluble platen, of an axle therefor, a hub mounted upon said axle, a line-space wheel mounted for independent movement upon said hub, an extension of Said hub comprising a plate having a camsuriace and a notch where the cam-surface begins, a pawl pivoted on said line-space wheel having one end resting in said notch and the other end free, and a spring fixed to said line-space wheel and having its free end pressing against the free end of the pawl to force the opposite end of the pawl into the notch, so that movement of said line-space wheel forces one end of the pawl out of the notch and upward on said camsurface, and forces the free end of the pawl downward, against the tension of the spring until it contacts with the cam-surface plate to lock the line-space wheel to said plate, and cessation of movement of the line-space wheel forces the pawl into the notch due to the tension of the spring, thus rotating the platen a small additional amount.

ALFRED G. F. KUROWSKI. 

